/**
 * Copyright www.cnjson.com &copy; 
 * http://www.cnjson.com
 * 2015-2017 All rights reserved.
 */
package cn.zhku.waterfowl.web;

import java.beans.PropertyEditorSupport;
import java.io.IOException;
import java.util.Date;
import java.util.List;

import javax.servlet.http.HttpServletResponse;
import javax.validation.ConstraintViolationException;
import javax.validation.ValidationException;
import javax.validation.Validator;

import cn.zhku.waterfowl.util.BeanValidators;
import cn.zhku.waterfowl.util.DateUtils;
import cn.zhku.waterfowl.util.modle.Message;
import org.apache.commons.lang3.StringEscapeUtils;
import org.apache.shiro.authc.AuthenticationException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.ui.Model;
import org.springframework.validation.BindException;
import org.springframework.web.bind.WebDataBinder;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.InitBinder;
import org.springframework.web.servlet.mvc.support.RedirectAttributes;

import cn.zhku.waterfowl.util.mapper.JsonMapper;

 

/**
* @author cgli, E-mail:cgli@qq.com
* @version created on ：Jan 6, 2017 4:41:09 PM
*/
public class BaseController {

	/**
	 * 
	 */
	public BaseController() {
		// the base controller constructor stub
	}
	
	/**
	 * 日志对象
	 */
	protected Logger logger = LoggerFactory.getLogger(getClass());

	/**
	 * 管理基础路径
	 */
	@Value("${adminPath}")
	protected String adminPath;
	
	/**
	 * 前端基础路径
	 */
	@Value("${frontPath}")
	protected String frontPath;
	
	/**
	 * 前端URL后缀
	 */
	@Value("${urlSuffix}")
	protected String urlSuffix;
	
//	/**
//	 * 验证Bean实例对象
//	 */
//	@Autowired
//	protected Validator validator;
	
	protected final static String ARTISAN_ID = "artisan_id";
	
	protected final static String USER_PARAMS_TOKEN  = "token";

//	/**
//	 * 服务端参数有效性验证
//	 * @param object 验证的实体对象
//	 * @param groups 验证组
//	 * @return 验证成功：返回true；严重失败：将错误信息添加到 message 中
//	 */
//	protected boolean beanValidator(Model model, Object object, Class<?>... groups) {
//		try{
//			BeanValidators.validateWithException(validator, object, groups);
//		}catch(ConstraintViolationException ex){
//			List<String> list = BeanValidators.extractPropertyAndMessageAsList(ex, ": ");
//			list.add(0, "数据验证失败：");
//			addMessage(model, list.toArray(new String[]{}));
//			return false;
//		}
//		return true;
//	}
//
//	/**
//	 * 服务端参数有效性验证
//	 * @param object 验证的实体对象
//	 * @param groups 验证组
//	 * @return 验证成功：返回true；严重失败：将错误信息添加到 flash message 中
//	 */
//	protected boolean beanValidator(RedirectAttributes redirectAttributes, Object object, Class<?>... groups) {
//		try{
//			BeanValidators.validateWithException(validator, object, groups);
//		}catch(ConstraintViolationException ex){
//			List<String> list = BeanValidators.extractPropertyAndMessageAsList(ex, ": ");
//			list.add(0, "数据验证失败：");
//			addMessage(redirectAttributes, list.toArray(new String[]{}));
//			return false;
//		}
//		return true;
//	}
//
	/**
	 * 服务端参数有效性验证
	 * @param object 验证的实体对象
	 * @param groups 验证组，不传入此参数时，同@Valid注解验证
	 * @return 验证成功：继续执行；验证失败：抛出异常跳转400页面。
	 */
//	protected void beanValidator(Object object, Class<?>... groups) {
//		BeanValidators.validateWithException(validator, object, groups);
//	}
//
//	/**
//	 * 添加Model消息
//	 * @param
//	 */
//	protected Message addMessage(Model model, String... messages) {
//		StringBuilder sb = new StringBuilder();
//		for (String message : messages){
//			sb.append(message).append(messages.length>1?"<br/>":"");
//		}
//		model.addAttribute("message", sb.toString());
//
//	}
	
	/**
	 * 添加Flash消息
	 * @param
	 */
	protected void addMessage(RedirectAttributes redirectAttributes, String... messages) {
		StringBuilder sb = new StringBuilder();
		for (String message : messages){
			sb.append(message).append(messages.length>1?"<br/>":"");
		}
		redirectAttributes.addFlashAttribute("message", sb.toString());
	}
	
	/**
	 * 客户端返回JSON字符串
	 * @param response
	 * @param object
	 * @return
	 */
	protected String renderString(HttpServletResponse response, Object object) {
		return renderString(response, JsonMapper.toJsonString(object), "application/json");
	}
	
	/**
	 * 客户端返回字符串
	 * @param response
	 * @param string
	 * @return
	 */
	protected String renderString(HttpServletResponse response, String string, String type) {
		try {
			response.reset();
	        response.setContentType(type);
	        response.setCharacterEncoding("utf-8");
			response.getWriter().print(string);
			return null;
		} catch (IOException e) {
			return null;
		}
	}

	/**
	 * 参数绑定异常
	 */
	@ExceptionHandler({BindException.class, ConstraintViolationException.class, ValidationException.class})
    public String bindException() {  
        return "error/400";
    }
	
	/**
	 * 授权登录异常
	 */
	@ExceptionHandler({AuthenticationException.class})
    public String authenticationException() {  
        return "error/403";
    }
	
	/**
	 * 初始化数据绑定
	 * 1. 将所有传递进来的String进行HTML编码，防止XSS攻击
	 * 2. 将字段中Date类型转换为String类型
	 */
	@InitBinder
	protected void initBinder(WebDataBinder binder) {
		// String类型转换，将所有传递进来的String进行HTML编码，防止XSS攻击
		binder.registerCustomEditor(String.class, new PropertyEditorSupport() {
			@Override
			public void setAsText(String text) {
				setValue(text == null ? null : StringEscapeUtils.escapeHtml4(text.trim()));
			}
			@Override
			public String getAsText() {
				Object value = getValue();
				return value != null ? value.toString() : "";
			}
		});
		// Date 类型转换
		binder.registerCustomEditor(Date.class, new PropertyEditorSupport() {
			@Override
			public void setAsText(String text) {
				setValue(DateUtils.parseDate(text));
			}
//			@Override
//			public String getAsText() {
//				Object value = getValue();
//				return value != null ? DateUtils.formatDateTime((Date)value) : "";
//			}
		});
	}

}
